All Black Widow Spiders are Deadly
Not all Black Widows are deadly. The adult female Black Widow’s poison can be deadly, but male and juvenile Black Windows are essentially harmless.
Natural and Physical Sciences
A broad category referring to the study of the physical universe including nature and biology.
At Its Core, Chemistry is Physics
On a fundamental level, chemistry can be explained by physics. The atoms that make up the periodic table elements are themselves made of quantum particles.
You Should Wait to Swim After Eating
You don’t have to wait to swim after you eat. Swimming after eating doesn’t cause cramps and has minimal to no effect on swimming performance.
Nettie Stevens Discovered the XY Sex-determination System
Nettie Stevens and Edmund Beecher Wilson independently discovered the chromosomal XY sex-determination system (that males have XY and females have XX sex chromosomes).
Nature Abhors a Vacuum
Aristotle once postulated “horror vacui” (Nature Abhors a Vacuum). It turns out nature really can’t stand a perfect vacuum.
Sound Always Travels Slower than Light
Sound usually travels slower than light, but not always. Under normal conditions, light moves roughly a million times faster than sound, but under the right conditions sound can travel faster than light.
Machines Can Think
Whether or not machines can think, depends on our definition of “think.” Generally we can say, machines can think, but they think differently than humans.
Toilets Flush Backwards in Australia
Despite the Coriolis Effect, toilets don’t flush backwards in Australia (or on the other side of the world, or in different hemispheres, or on one side of the equator).
The Sun Can Reverse its Magnetic Field
The Sun’s magnetic field “flips” in cycles, with its field regularly weakening and strengthening, and reversing polarity roughly once every eleven years.
All Mammals Start as Female
Mammals don’t start as females, they start as a blank slate with XX or XY genetic code, and for the first 5-6 weeks of gestation only the X gene expresses.